2014A&A...567A..14T


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST02:34:32

2014A&A...567A..14T - Astronomy and Astrophysics, volume 567A, 14-14 (2014/7-1)

Confirmation of an exoplanet using the transit color signature: Kepler-418b, a blended giant planet in a multiplanet system.

TINGLEY B., PARVIAINEN H., GANDOLFI D., DEEG H.J., PALLE E., MONTANES RODRIGUEZ P., MURGAS F., ALONSO R., BRUNTT H. and FRIDLUND M.

Abstract (from CDS):

We announce confirmation of Kepler-418b, one of two proposed planets in this system. This is the first confirmation of an exoplanet based primarily on the transit color signature technique. We used the Kepler public data archive combined with multicolor photometry from the Gran Telescopio de Canarias and radial velocity follow-up using FIES at the Nordic Optical Telescope for confirmation. We report a confident detection of a transit color signature that can only be explained by a compact occulting body, entirely ruling out a contaminating eclipsing binary, a hierarchical triple, or a grazing eclipsing binary. Those findings are corroborated by our radial velocity measurements, which put an upper limit of ∼1MJup on the mass of Kepler-418b. We also report that the host star is significantly blended, confirming the ∼10% light contamination suspected from the crowding metric in the Kepler light curve measured by the Kepler team. We report detection of an unresolved light source that contributes an additional ∼30% to the target star, which would not have been detected without multicolor photometric analysis. The resulting planet-star radius ratio is 0.110±0.0025, more than 25% more than the 0.087 measured by Kepler leading to a radius of 1.20±0.16RJup instead of the 0.94RJup measured by the Kepler team. This is the first confirmation of an exoplanet candidate based primarily on the transit color signature, demonstrating that this technique is viable from ground for giant planets. It is particularly useful for planets with long periods such as Kepler-418b, which tend to have long transit durations. While this technique is limited to candidates with deep transits from the ground, it may be possible to confirm earth-like exoplanet candidates with a few hours of observing time with an instrument like the James Webb Space Telescope. Additionally, multicolor photometric analysis of transits can reveal unknown stellar neighbors and binary companions that do not affect the classification of the transiting object but can have a very significant effect on the perceived planetary radius.

Abstract Copyright:

Journal keyword(s): techniques: photometric - planetary systems - stars: individual: KOI-1089 - stars: individual: KIC 3247268

VizieR on-line data: <Available at CDS (J/A+A/567/A14): z_gtc.dat g_gtc.dat rv_not.dat>

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 817 0
2 CoRoT-9b Pl 18 43 08.8101080314 +06 12 14.912939950           ~ 57 1
3 BD+44 3020b Pl 18 56 14.3077765754 +44 31 05.389239372           ~ 50 1
4 CoRoT 211630451 * 19 02 14.4603459642 +02 05 32.776079374   16.87 15.638 15.908   ~ 1 0
5 Kepler-22b Pl 19 16 52.1904191915 +47 53 03.947532134           ~ 74 1
6 KIC 3247243 * 19 37 42.8248684564 +38 21 17.200768094           ~ 1 0
7 Kepler-418b Pl 19 37 44.0464962871 +38 21 19.662838404           ~ 24 0
8 Kepler-418 Ro* 19 37 44.0464962871 +38 21 19.662838404           ~ 37 0
9 KOI-1089.02 Pl? 19 37 44.0464962871 +38 21 19.662838404           ~ 20 0
10 Kepler-11 Ro* 19 48 27.6228219845 +41 54 32.902654079       14.00   G2V 296 1

    Equat.    Gal    SGal    Ecl

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2020.07.08-02:34:32

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